dplyr implements the four most useful joins from SQL
Many to one on
by = "varname"
: common named variablec("origin" = "faa")
: different variablesleft_join(x, y) includes all observations in x, regardless of whether they match or not. This is the most commonly used join because it ensures that you don’t lose observations from your primary table.
If a match is not unique, a join will add all possible combinations.
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